In a horrific racist tirade, Michelle Brown – a UKIP member in North Wales – called the respected Labour MP for Streatham a “f****** coconut.”

Now calls are being made for Ms Brown to be de-selected after saying Mr Umunna was “black on the outside, white on the inside” in a recorded phone conversation with her senior adviser at the time, Nigel Williams.

In the foul-mouthed exchange – recorded on May 14 2016 – Ms Brown also described former Labour MP Tristran Hunt a “t**t”.

Ms Brown has since apologised to anyone offended by her comments and said the language she used about Mr Umunna was “inappropriate”.

In a statement, she said: “The point I was making is that, because of his considerable wealth and privilege, Chuka Umunna cannot possibly understand the difficulties and issues that the average black person faces in this country any more than I can and I stand by that assertion.

“I do however accept that the language I used in the private conversation was inappropriate and I apologise to anyone that has been offended by it.

“As far as the language I used about Mr Hunt is concerned, it was a private conversation and I was using language that friends and colleagues often do when chatting to each other.”

The secretary of UKIP's Delyn branch, Shaun Owen, has written to the party's National Executive Committee calling for Ms Brown to be removed, the BBC reports.

In his letter Mr Owen said: “The north Wales branches call on head office to deselect/remove Ms Brown as our UKIP representative both at the local level and as our representative in the Welsh Assembly.”

A spokesperson for the National Assembly for Wales Labour group said: “This is absolutely outrageous language and lays bare the disgusting racism at the heart of UKIP.

“Anything less than immediate suspension would be a clear endorsement of Michelle Brown’s racist slur.”

Mr Williams worked for Ms Brown for just over a year before being sacked by her in May this year and was previously a police detective of 14 years in North Wales and Merseyside.

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Drinking a beer while adorned with the St George's Cross at the Northwood Club in Ramsgate, Kent

He said he spoke out after recently discovering the conversation among his records.

“I was absolutely appalled,” Mr Williams said.

“It’s bad enough coming from anybody, but to come from a newly appointed Assembly Member is absolutely appalling.

“I’ve seen swearing and I’ve been called all sorts of names myself, but I’ve actually never seen it from somebody in such a position.

“This was just a conversation that Michelle Brown was having, which she thought was OK.”